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Keywords = HDE and MHRDE model

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13 pages, 364 KiB  
Article
A Note on Varying G and Λ in Chern–Simons Modified Gravity
by Sarfraz Ali, Maryam Saif, Khuram Ali Khan, Nehad Ali Shah and Wajaree Weera
Symmetry 2022, 14(7), 1430; https://doi.org/10.3390/sym14071430 - 12 Jul 2022
Cited by 5 | Viewed by 2526
Abstract
We have considered the holographic dark energy and modified holographic Ricci dark energy models to analyze the time-dependent gravitational constant G(t) and cosmological constant Λ(t) in the context of Chern–Simons modified gravity theory. The FRW metric is [...] Read more.
We have considered the holographic dark energy and modified holographic Ricci dark energy models to analyze the time-dependent gravitational constant G(t) and cosmological constant Λ(t) in the context of Chern–Simons modified gravity theory. The FRW metric is used to examine the physical and kinematical properties of these models, which predicted the accelerated expansion phase of universe. Further, the Λ(t) showed increasing trends while G(t) showed decreasing trends for both cases. Finally, the range 1.99×1010yr1G˙G0 was estimated mathematically, which is similar to the results obtained from observational data. Full article
(This article belongs to the Special Issue Symmetry in Relativity, Gravitation, and Cosmology)
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